package string;
/*
StringBuilder代码
*/
public class StringBuilderDemo {
    public static void main(String[] args) {
        //将str复制到builder
        String str = "好好学习java";
        StringBuilder builder = new StringBuilder(str);
        System.out.println(str);

        //append():追加内容，在末尾追加
        builder.append("，为了找个好工作");
        System.out.println(builder);

        //replace():替换部分内容（含头不含尾）
        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        //delete():删除部分内容（含头不含尾）
        builder.delete(0,8);
        System.out.println(builder);

        //insert():插入内容
        builder.insert(0,"活着");
        System.out.println(builder);



     /*   //StringBuilder的创建方式:
        StringBuilder builder1 = new StringBuilder(); //空字符串
        StringBuilder builder2 = new StringBuilder("abc"); //abc串

        //String和StringBuilder互相转化
        String str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str2 = builder3.toString();//转为string*/

    }
}
